add indexes for ORDER BY fields used in code

we hit ER_OUT_OF_SORTMEMORY with large tables

migrations/schema.sql

@@ -138,6 +138,7 @@ CREATE TABLE IF NOT EXISTS backups(
     format VARCHAR(16) DEFAULT "tgz",
     preserveSecs INTEGER DEFAULT 0,
 
+    INDEX creationTime_index (creationTime),
     PRIMARY KEY (id));
 
 CREATE TABLE IF NOT EXISTS eventlog(
@@ -147,6 +148,7 @@ CREATE TABLE IF NOT EXISTS eventlog(
     data TEXT, /* free flowing json based on action */
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 
+    INDEX creationTime_index (creationTime),
     PRIMARY KEY (id));
 
 CREATE TABLE IF NOT EXISTS domains(
@@ -225,6 +227,8 @@ CREATE TABLE IF NOT EXISTS tasks(
     resultJson TEXT,
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+
+    INDEX creationTime_index (creationTime),
     PRIMARY KEY (id));
 
 CREATE TABLE IF NOT EXISTS notifications(
@@ -235,6 +239,8 @@ CREATE TABLE IF NOT EXISTS notifications(
     message TEXT,
     acknowledged BOOLEAN DEFAULT false,
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    INDEX creationTime_index (creationTime),
     FOREIGN KEY(eventId) REFERENCES eventlog(id),
     PRIMARY KEY (id)
 );